(57) A device for closing and sealing containers (2) made of heat-weldable plastic material,
having a bottom (3) open, picked up open from a feeding station (18) of a packaging
machine (100) and transferred closed to a removal station (17), includes:
- a working carousel (10) rotating and supporting a plurality of pliers assemblies (20),
positioned along the perimeter of the working carousel (10) and fit for supporting
and stopping at least a container (2), squeezing the bottom (3) thereof, in such a
way to carry out a bottom portion (4), in correspondence of a closing condition (B)
of said container;
- a plurality of heating stations (15), radially positioned around the working carousel
(10) including melting means assembly (60) and fit for melting the bottom portion
(4) of each container (2).
The working carousel (10) is fit for rotating the plurality of the pliers assemblies
(20) transferring the containers (2) to the removal station (17) through the plurality
of heating stations (15) which plastically mould the melted bottom portion (4), compressing
this latter according to a direction almost transversal to the longitudinal axis of
the container (2).
The plurality of heating stations (15) have an oscillatory motion having direction
approximately radial with respect to the working carousel (10), in such a way to led
the melting means assemblies (60) contacting the bottom portion (4), in correspondence
of an heating condition (E) of said melting means assemblies (60).
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